Design changes over the popular SNT105 included the classic SNT metal top and bottom lids (the fastening tab on plastic sliding lid to of the SNT105 caddy was able to break easily), and a near identical caddy similar to the spacious one found with the SNT101. The addition of the sleeve bearing fan to draw hot air out of the caddy was a godsend for use with current Ultra-33 and Ultra-66 drives.